STEINMAN--Ralph M. The Rockefeller University community mourns with deep sadness the loss of our beloved friend and colleague Ralph Steinman. Dr. Steinman was an immunologist whose discovery of the dendritic cell expanded our understanding of the immune system and promises to revolutionize the way disease is treated. For this work, he was awarded the 2011 Nobel Prize in Physiology or Medicine. In addition to the Nobel Prize, he was honored with the Albert Lasker Basic Medical Research Award, the Albany Medical Center Prize and the Gairdner Foundation International Award, among many others. He was elected a member of the National Academy of Sciences and its Institute of Medicine. Dr. Steinman served the university with distinction for more than 40 years. He was the Henry Kunkel Professor and director of the Christopher H. Browne Center for Immunology and Immune Diseases, and he was a senior physician at The Rockefeller University Hospital. Dr. Steinman was a gifted teacher and mentor, and he will be greatly missed. We extend our heartfelt condolences to his wife, Claudia, his children, Adam, Alexis and Lesley, his mother, Nettie, and the entire Steinman family, as well as his many friends on campus. Marc Tessier-Lavigne, President David Rockefeller, Honorary Chairman Russell Carson, Chairman Paul Nurse and Torsten Wiesel, Presidents Emeriti